@@ -14,6 +14,8 @@ use std::io::{BufRead, BufReader, Read, Write};
1414use std:: path:: { Path , PathBuf } ;
1515use std:: process:: { Child , Command , Stdio } ;
1616use tempfile:: TempDir ;
17+ #[ cfg( target_os = "linux" ) ]
18+ use { std:: fs:: Permissions , std:: os:: unix:: fs:: PermissionsExt } ;
1719
1820#[ derive( Clone , Copy , Debug ) ]
1921enum OvmfFileType {
@@ -127,6 +129,34 @@ impl OvmfPaths {
127129 }
128130 }
129131
132+ /// Get the NixOS OVMF paths for the given guest arch.
133+ fn nixos ( arch : UefiArch ) -> Option < Self > {
134+ let os_info = os_info:: get ( ) ;
135+ if os_info. os_type ( ) != os_info:: Type :: NixOS {
136+ return None ;
137+ }
138+ let path = std:: env:: var_os ( "OVMF" ) . expect ( "Must have OVMF env var. Run '$ nix-shell'" ) ;
139+ let path = path. to_str ( ) . unwrap ( ) ;
140+ let paths = match arch {
141+ // Package "edk2-aarch64".
142+ UefiArch :: AArch64 => Self {
143+ code : format ! ( "{path}/FV/AAVMF_CODE.fd" ) . into ( ) ,
144+ vars : format ! ( "{path}/FV/AAVMF_VARS.fd" ) . into ( ) ,
145+ } ,
146+ // Package "edk2-ovmf-ia32".
147+ UefiArch :: IA32 => Self {
148+ code : format ! ( "{path}/FV/OVMF_CODE.fd" ) . into ( ) ,
149+ vars : format ! ( "{path}/FV/OVMF_VARS.fd" ) . into ( ) ,
150+ } ,
151+ // Package "edk2-ovmf".
152+ UefiArch :: X86_64 => Self {
153+ code : format ! ( "{path}/FV/OVMF_CODE.fd" ) . into ( ) ,
154+ vars : format ! ( "{path}/FV/OVMF_VARS.fd" ) . into ( ) ,
155+ } ,
156+ } ;
157+ Some ( paths)
158+ }
159+ 130160 /// Get the Windows OVMF paths for the given guest arch.
131161 fn windows ( arch : UefiArch ) -> Self {
132162 match arch {
@@ -157,6 +187,9 @@ impl OvmfPaths {
157187 }
158188 candidates. push ( Self :: debian_linux ( arch) ) ;
159189 candidates. push ( Self :: fedora_linux ( arch) ) ;
190+ if let Some ( paths) = Self :: nixos ( arch) {
191+ candidates. push ( paths) ;
192+ }
160193 }
161194 if platform:: is_windows ( ) {
162195 candidates. push ( Self :: windows ( arch) ) ;
@@ -497,6 +530,10 @@ pub fn run_qemu(arch: UefiArch, opt: &QemuOpt) -> Result<()> {
497530 // versions of OVMF won't boot if the vars file isn't writeable.
498531 let ovmf_vars = tmp_dir. join ( "ovmf_vars" ) ;
499532 fs_err:: copy ( & ovmf_paths. vars , & ovmf_vars) ?;
533+ // Necessary, as for example on NixOS, the files are read-only inside
534+ // the Nix store.
535+ #[ cfg( target_os = "linux" ) ]
536+ fs_err:: set_permissions ( & ovmf_vars, Permissions :: from_mode ( 0o666 ) ) ?;
500537
501538 add_pflash_args ( & mut cmd, & ovmf_paths. code , PflashMode :: ReadOnly ) ;
502539 add_pflash_args ( & mut cmd, & ovmf_vars, PflashMode :: ReadWrite ) ;
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